Multiple choice

Which of the following phenomena causes the shape of Earth?

  1. Internal structure

  2. Atmospheric pressure

  3. Rotation

  4. Revolution
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Earth's shape is an oblate spheroid - slightly flattened at the poles and bulging at the equator. This is caused by Earth's rotation. The centrifugal force from rotation is strongest at the equator, causing material to bulge outward there. The equatorial diameter is about 43 km greater than the polar diameter. Revolution (orbit around the Sun) and atmospheric pressure do not affect shape.

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